This is the standards chapter in the Principles and Standards for School Mathematics of the National Council of Teachers of Mathematics. Select Problem Solving or Algebra from the left column for across-the-grades standards. For specific grade level standards select Pre-K - 2, 3 - 5, or 6 - 8, from the top row. (
http://standards.nctm.org/document/chapter3/index.htm
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An interactive lesson for creating, analyzing, and extending patterns, from the electronic examples of the Principles and Standards for School Mathematics. (Pre-K-2) (
http://standards.nctm.org/document/eexamples/chap4/4.1/index.htm
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A very interesting site that discusses many occurrences of Fibonacci numbers in nature. (
http://www.computing.surrey.ac.uk/personal/ext/R.Knott/Fibonacci/fibnat.html
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The Games and Puzzles section has over 40 problem solving puzzles. The Toads and Frogs is like the Peg Jumping Puzzle and can be played on the computer. (
http://www.cut-the-knot.com/
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